Gregory P. Smith firstname.lastname@example.org wrote:
Ubuntu compiles their Python with FDO (feedback directed optimization / profile guided optimization) enabled. All distros should do this if they don't already. It's generally 20% interpreter speedup. Our makefile already supports it but it isn't the default build as it takes a long time given that it needs to compile everything twice and do a profiled benchmark run between compilations.
Yes, I didn't know we already had `make profile-opt`. With that option the self-compiled results are nearly the same as with the Ubuntu version, the remaining difference might be due to Ubuntu's use of -flto, as Matthias suggests in http://bugs.python.org/issue17781 .